| Lists: | pgsql-novice |
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| From: | "JORGE MALDONADO" <jorgemal1960(at)gmail(dot)com> |
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| To: | pgsql-novice(at)postgresql(dot)org |
| Subject: | FOREIGN KEY AND INDEXEX |
| Date: | 2008-10-28 20:04:17 |
| Message-ID: | f03943a00810281304r3e6340a8qa1669047d87d1640@mail.gmail.com |
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| Lists: | pgsql-novice |
I need to define an index for a table but such an index already exists as a
foreign key.
I have fk_state (a foreign key) and I need a common index (ix_state).
Should I define the index or does the foreign key work like an index too?
With respect,
Jorge Maldonado
| From: | Alan Hodgson <ahodgson(at)simkin(dot)ca> |
|---|---|
| To: | pgsql-novice(at)postgresql(dot)org |
| Subject: | Re: FOREIGN KEY AND INDEXEX |
| Date: | 2008-10-28 21:26:43 |
| Message-ID: | 200810281426.43844@hal.medialogik.com |
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| Lists: | pgsql-novice |
On Tuesday 28 October 2008, "JORGE MALDONADO" <jorgemal1960(at)gmail(dot)com>
wrote:
> I need to define an index for a table but such an index already exists as
> a foreign key.
> I have fk_state (a foreign key) and I need a common index (ix_state).
> Should I define the index or does the foreign key work like an index too?
You need the index. Primary keys and unique constraints are implemented as
indexes, but not foreign keys.
--
Alan